Subleases (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2024 USD ($) ft²	Jun. 30, 2024 USD ($) ft² lease	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) ft² item lease	Jun. 30, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Number of aseet groups identified | item				3
Impairment of long-lived assets (non-cash)		$ 2,951,000		$ 2,951,000
Sublease
Lessee, Lease, Description [Line Items]
Sublease term	2 years
South San Francisco
Lessee, Lease, Description [Line Items]
Area of subleased property | ft²	8,000	107,000		107,000
Sublease term	2 years
Option to extend	false
Monthly base rent	$ 38,000
Expected sublease income	$ 900,000
Operating sublease income		$ 2,204,000	$ 2,090,000	$ 4,294,000	$ 4,180,000
Total Area | ft²		162,000		162,000
Number of separate Subleases entered | lease		3		3
Remaining vacant space for sublease | ft²		31,000		31,000
Increase in annual base rent (as a percent)	3.00%
South San Francisco | Asset Groups Subject To Impairment Evaluation
Lessee, Lease, Description [Line Items]
Number of aseet groups identified | item				2
Expected sublease income				$ 3,300,000
Remaining vacant space for sublease | ft²		22,000		22,000
Discount rate		9.70%		9.70%
Impairment of long-lived assets (non-cash)		$ 3,000,000.0		$ 3,000,000.0